叠加应力影响巷道围岩变形规律及控制技术研究  

Deformation law and control technology of roadway surrounding rock under superimposed stress

作　　者：陶广美 周晋碧 马赛 张江利 TAO Guang-mei;ZHOU Jin-bi;MA Sai;ZHANG Jiang-li(Shanxi Jincheng Anthracite Mining Group Technology Research Institute Co.,Ltd.,Jincheng 048000,China;Shanxi Jincheng Anthracite Mining Group Co.,Ltd.,Jincheng 048000,China)

机构地区：[1]山西晋煤集团技术研究院有限责任公司,山西晋城048000 [2]山西晋城无烟煤矿业集团有限责任公司,山西晋城048000

出　　处：《煤炭工程》2020年第11期47-51,共5页Coal Engineering

摘　　要：为了解决上覆煤柱应力叠加影响下巷道变形严重的问题,通过现场实测对巷道变形规律进行研究,采用钻孔窥视及静压注水试验对围岩破碎特征进行分析,制定了先注浆、再对锚杆二次预紧、最后预应力锚索补强的综合围岩控制方案,并进行工业性试验,结果表明:巷道修复后0~18d为初始变形阶段,是巷道治理的关键阶段;巷道浅层煤体裂隙发育数量较多且连通性较好,深层裂隙发育较少且连通性差,需要采用预应力锚索进行全长锚固补强;采用综合围岩控制方案后,巷道变形量得到有效控制,底鼓量最大为51mm,两帮最大移近量为42mm,顶板沉降量为4mm,巷道变形得到有效控制。In order to solve the problem of serious deformation of roadway under the influence of stress superposition of overlying coal pillars,the deformation law of roadway is studied through field measurement,and the fracture characteristics of surrounding rock are analyzed by borehole peeping and hydrostatic water injection test. A comprehensive treatment scheme is formulated including grouting,pre-tightening with bolt and strengthening with pre-stressed anchor cable,and the industrial test is carried out. The results show that: the initial deformation stage is 0—18 days after restoration,which is the key stage of roadway treatment. The shallow coal body has a large number of fissures and good connectivity,and the deep coal has a small number of fissures and poor connectivity,so it is necessary to use pre-stressed anchor cable for full-length anchoring reinforcement. After implementation of the comprehensive treatment scheme,the roadway deformation is controlled,the maximum floor heave is 51 mm,and the maximum convergence of the roadway side walls is 42 mm,the roof settlement is 4 mm.

关 键 词：叠加应力 持续变形 注浆加固 巷道治理 全长预应力锚固 

分 类 号：TD353[矿业工程—矿井建设]